Nytol contains an antihistamine and should not be taken by those who are allergic to diphenhydramine or by those with the following conditions: asthma, narrow angle glaucoma, chronic pulmonary disease, shortness of breath, stomach ulcers, pyloro-duodenal obstruction, symptomatic prostatic hypertrophy or bladder neck obstruction unless directed by a doctor. Nytol should be used with caution in patients with seizure disorders. Insomnia may be a symptom of a serious underlying medical illness. If sleeplessness...